Anybody know where to get a steel chain like Quinton Rampage Jacksons online?

looks like a steel bike lock

homedepot.com

It's just a standard chain with what is called a "Rapid Link" or a "Quick Link". It's shaped like a "C" with a section that screws closed to complete the link.

The chain and the rapid link should run you a total of about $10 depending on the gauge you want to use.

Lowes has heavy duty chains; if you don't see the size you want they can also order a heavier one with bigger, thicker, links.

Ace hardware